Means for locking nuts and bolts



Patented Jan. 1,3, 1931 RONALD JOHN LIVINGSTONE HILDYARD, F MELBOURNE,VICTORIA, AUSTRALIA MEANS non LOCKING NUTS kAND BoLTs j Applica/cinflied April 18, 1928,*seria1 No.

This invention has been vdevised to provide improved means forlockingnuts andV bolts of all types So as to prevent same from working loose,even whenthey are subjected to great vibration and heavy strains. The

locking means are simple, cheap to produce,

convenient to apply and in practice will be found most effective for thepurpose devised.

The invention basically comprises a lockloing member adapted forinsertion between the workpiece and the nut or the bolt head, saidlocking member beingadapted to be restrained against rotation andprovided with means for engaging theV nut or bolt head whereby the nutor bolt is locked against rotation. ,Y In the accompanying drawings:VFigure l is a vertical sectional view, wit

parts in elevation, illustrating the invention'.-

Y VFigure 2 is a transverse section, with parts in plan, sh0wing'thelocking means in applied position.

Referring to the drawing 2 is a locking washer adapted for insertionbetween the nut 3 and the workpiece 4 of A wood or other non-metallicmaterial. is provided with teats or small projections 5 preferablypressed therefrom and adapted to penetrate the work-piece when the nutis tightly screwed against the said washer. The penetration of the teatsor projections 5 into the workpiece locks the washer against rotation.

The locking washer has one or more lat eral and integral lugs orprojections 6 adapted to be upturned to engage the nut when same isscrewed home and thus function as a lock to prevent unscrewing movementof the nut on the bolt. These lugs or projections of the washer can beof required size and design to engage a side or sides, or side and topportions of the nut.

VThe locking washer having been interposed between the nut-3 andworkpiece 4, and the nut having been tightly screwed home, the laterallugs or projections 6 ofV arel bent upwardly the locking washer againstthe sides of the nut as shown in Figure Y2.V The teats or projections 5by penetrating into the workpiece hold the This wasliei 270,967, vand inAustrana January 7, 192s.

v*locking washer stationary, while the lugs 6 on said washer preventunscrewing of the' nut even under conditions of greaty vibration. j

its bolt, it is only necessarytoknock down `Vhe'n it is required toremove a nut from` the lugs 6 of thewasher until they are in V55- theiroriginal position to thus releasethe nun-which latter is then removableby the use of a wrench in the ordinary manner.

in addition tothe locking of the nut, a locking washer 2a is applied tothe head of the bolt, and a wire 15L is employed. This tie wirel ispassed around the bolt and twisted as at l'beneath the locking washer topenetrate into .the workpieceand the free 'end 16, is passed through ahole 17 provided in the locking washer. bent inwardly and is seated `in'the usual slot 1 8 ofthe bolt head. Y

By this construction and arrangement one end 'of the-wire is impressedin the wood land Y the opposite end is seated in the slot in the head ofthe screw and the bolt is prevented from turning.

What I do claim is :4 Y f l. Improved means for locking bolts and thelike against rotation comprising, a locking washer adapted to beinserted between the bolt head and the workpiece, and a tie wire havinga portion encirclingl the bolt beneath the bolt head and another portionIn order Vthat the bolt may also be locked 6 The free end l'is'then lsoVY of said tie wire which is adapted to. be

passed through a hole in the locking washer to lit into a' slot orrecess in the bolt head.l 2;.An improved means Vfor locking nuts, boltsand the like against rotation, as claimed in claim l, Vwherein the tiewire is wound about the bolt directly beneath the locking washer, sothat such tie wire may be forced into the workpiece when the nut or bolthead is tightened.

In testimony whereof I aliX my signature.

RONALD J. L. HILDYARD.

